Selective telegraph system.



E. A. BURLINGAME.

SBLBCTIVB TELEGRAPH SYSTEM.

Patenta Nov.18,1913.

APPLICATION FILED JAN. 6, 1910.

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E.A.BURLINGAME.

SELECTIVE TELEGRAPH SYSTEM.

APPLIoATIon FILED JAN.e,1e1a

1,078,899. Patented N0v.18,1913.

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v TTk E. A. BURLINGAME. SELECTIVB TBLEGRAPH SYSTEM.

APPLIGATION FILED JAN. 6, 1910.

1,078,899, Patented Nov. 18, 1913.

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E. A. ,BURLINGAMR SELBGTIVE TELBGRAPH SYSTEM.

APPLIOATION FILED JAN. e, 1910.

1,078,899. Patented Nov. 18, 1913.

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ELMEB A. BURLINGAME, OF BOSTON, MASSACHUSETTS; ASSIGNOB. TO BUBLINGAMETELEGBAPHING TYPEWBITER COMPANY, 0F BOSTON, MASSACHUSETTS, A CORPO-MTION 0F WASHINGTON.

SELECIIVE -TELEGBAPH SYSTEM.

Specification of Letters Patent.

Patent-ed Nov. It, 1913.

Application mea January c, 1910. seria: No. 536,516.

Bc it known that I, Emana A.' Bonnin- 'Gamn a citizen of the UnitedStates, ren-iding at Boston, county of Suffolk, Commonwealth ofMassachusetts, have invented certain new and useful Improvements inSelective Telegraph Systems, of which the following is n specification.s,

This invention relates to a system for securing selection through anelectric circuit, and particularly to the selection of one or .more of anumber of local circuits'atl a diatalue over n single wire. 'Ihn localcir- Cuit Selected may be employed to make a still further selection orto start or operate or cut off any mechanisms or devices or to doanything cupnhle of control by a local circuit.

In order to simplify the discussion of my invention this applicationwill treat my involition with particular'relation to the se- 'lectin ofoperating paris of mechanims intended to transmit messages, and as aspe,- cilic illustration or my invention I shall dif;- closn and diseno#the saule with relation to the tranmiseion ol` charm'leristic impulsesfor the operation of meclmnislus at. fi distance intended to produce a)erforated tape cu'pnble of operating a mec ianicnlly operatadtypewriter or similar printing device. In the operation of such systemsheretofore dilliculty and delay huve heen experienced both in theselective systems :indio the employment of, the dili'erenl zngfenc'iescomposlng the same. (lonsideralde vdelay has heen involved on account ofthe 'dill'erence of Speed ut which the character impulse selection, thetransmission, and the receiving or printing mechanisms could heoperated. For instance, where a tape has heen prepared withcharacteristic perl'orntione for use in a 'looal trmismitting.r devicethe operation of the receiving machine has not been Sulli- 4 cientlyrapid to receive the :entire intelligencc transmitted. Ooe'of thefeatures of my present inven tion, therefore, is a system in which the'the tapes of at least two transmission systems.

Various feature? of the system und the construction and arrangement ofthe parts will be more fully described in the spccilication whichfollows. In theslxcification, as explained ahove,'by u system involvingmy invention I have set forth an illustrative embodiment thereof, andthis I have illustrated in the drawings which form apart of thespecification.'

'lhroughout specifiaition und drawings like reference numerals areemployed to indicate correapondinnr parts throughout', and in thedrawings: Figure 1 is a diagrammatic viow .showing a selectivetransmission System, Fig. 2 a diagrammatic illustration of a receivingsystem for the same, Fig. 3- a detail of the. line closer contacts, Fig.4 a detail of thc switch contacts, Fig. 5 a detail view of n portion ofthe controlling mechanino,` of the actuating system for the lineclon-rs, and Fig, (l a detail of the tape feed,

l is a generator having a line 2 connected to itA positive brush and a'line 3 connected lo its negative brush.

l is a line connmzted with a resistance 5 :ind in circuit with thenegative brush.

t5 aud 7, B- and J and l0 and 11- are pairs of line clos/ers, each ofsaid line cloaers conf `dating of a three blade switch, The closer ocons-ists of a central blade 61, a lower hhide ti und un upper blade Gi.Euch of the other line closers 7, 8, 0,10 and 11 have similarly arrangedmiddle, lower and u per blades. The lower blades 6'* and 72 0 the pair7; 8 and 92 of the pair 8, 9; 10z

'and 112 of the pair 10, 1l am connected.

The middle bladenl 7, 8" of the switches 7 and 8 und 91, 10l of theswitches V9, 10 are.

also wnuacted and the blade 6* vof the switch ti is connected with thenorth linelf, While the blade l1l of the switch 11 is connected with thesouth line 13.

Thenpper blades 6*, 7*, 8, 9', 1,0s and 11 are connected as follows: Theupper blade 6 of the switch 6 is connected to a, line 14,while the upperblade 7 of the switch I is connectedto a line 15. In like manner thenper blade 8" of the switch Ell is connected to ine 16 similar to 14,while the upper blade 9' 0f the switch 9 i8 connected tn o lino 17,'

l(it) ,a corresponding contact member 411.

`switch member.

in the following manner: v groups of four switches, to wit: thoserepresimilar to the line 15, and the upper blade 103 of the switch 10 isconnected to a line 18, similar to 14 and 16, while the upper blade 113of the switch 11 is connected to a line 19, similar to lines 15 and 17.

21 to 32, inclusive are arms of twelve switches, each switch consistingof two pairs of contacting blades, that is to say, the blade 21 has acorresponding contact member 211. The blade 21, by means of aninsulating rod 211, further operates a blade 41 which bias T e remainingswitches, 22 to 32, inclusive, have similar insulating rods (pot shown).In the same way the blade 22 as a corresponding contact member 221 andoperates a blade 42 which has a corresponding contact member 421. Thesedouble switches are arranged in groups of four, that is to say, theswitches of which t-he blades 21, 22, 23 and 24 are members constituteone group; those switches of which the blades 25- to 28, inclusive, aremembers constitute a second group; while those switches of which theblades 29 to 32 are members constitute a third group.

250 to 261, inclusive, are twelve operating bars, each having a hook forengagement with the first named arm of the double For instance, the bar250 has a hook 2501 which engages the arm 22 of the second doubleswitch.

270 is one of a plurality of operating keys. There will be the samenumber of these keys as there are double combinations in the selectingdcvice. For instance, in the system shown, there might be sixty-fourkeys, or any part of sixty-four, according to the number of letters,numbers, or other characters desired to be transmitted.

The double switches are connected with the lines 2, 3, 4, 14, 15, 16,17, 18, and 19 Each of the sented by the levers 21 to 24, inclusive; 25to 28, inclusive; and 29 to 32, inclusive; are connected to the lines 14and 15; 16 and 17; and 18 and 19, respectively. That is to say,

ythe switches. of which the levers 21 to 24 are a part are connectedtothe lines 14 and 15 which lead to the line closers 6 and 7, while asecond group is co-nnected to the lines 16 and 17, connected with theline closers8 and 9, while the third group is connected by the lines 18and 19 to the line closers 10 and 11. In each group the four doubleswitches are connected asY follows: I will refer to the first group onthe left of Fig. 1 as illustrative of the connection of the other twogroups. In the first switch,

of which the levers 21 to 41 are members,

the lever 21 is connected to the line 15 while the lever. 41 isconnected to the line 14. In the next' switch the lever 22 is connectedto the line 14 While Athe lever 42 is connected to the line 15. It willthus be seen that in each group of four the connection of the upper andlower levers of each switch tothe lilies 14 and 15 is reversedalternately. It is further to be noted that the contacts 411 and 421 areconnected with the line 3 which is the negative line, while thecont-acts 211, 221 are connected with line 2 which is the positive line.This same connection applies in the, other two groups of four doubleswitches, each having their upper and lower levers 25, 45, 26, 46, 27,47, 28, 48, similarly connected alternately to one or the other of thelines 16 and 17 and their contacts 451, 461, 471, and 481 connected inalternate pairs to apply the line 2 and the line 3. We have therefore,twelve double switches divide into three groups of four each, half ofeach groupl having a connection with one of a pair of oppositelyconnected line closers and the other half withthe other of saidoppositelytconnected line closers, these groups being arrangedalternately with `one contact of thc double switches (arranged in pairs)connected to either the negative line 3 or, the negative resistance line4. therefore, possible through the selection of one of the group of fourswitches with their oppositelyv connected line closers a stron' or aweak current which may be delivere to the line in' either the positiveor the ne a- Itive direction. These groups of four dou le switches withtheir pairs of oppositely connected line closers have been so. fartreated independently -but-it is to be borne in mind that the generatorconnections run through all three groups in symmetrical series. Thisisfor the reason that in the present example, used for illust-ration, Iam contemplating the transmission of a treble impulse. It will be noted,therefore,'that the positive line 2 is connected with each one of 'thelower con- There is,

tacts 211, 221, etc., to 321, inclusive, while the negative line 3connects with the uppercontact-s in pairs, to wit: with 411, 421, 451,

461, 491, 501, while the negative resistance line 4 connects with theupper contacts in pairs 431, 441, 471, 481, 511, 521. The con` nectionof the upper and lower switch arms,

represented by the series 2 1 and 41 has been explained and .it nowremains to describe the line closing\ system whichsends to the linecharacteristic treble impulses selected through a series of switches.

As was early noted, the switches indicated by the general numbers 6, 7;8, 9; and 10, 11, constitute three pairs of line closers, one each osaid pairs being connected to what we will call the north line 12 andthe other t'o the south line 13. It will be understood that in anintermediate station the lines 12 and 13 might go in oppositedirections, while at a terminal station one line-0r the other wouldbegrounded.

i leieri'ing to Fig. 3 for a minute it will be;

seen that there are three arme which l have numbered G, (i2, and 1). tocorrespond with the first line closer indieated at this, left of Fig. 1.Ity is to he borne in mind that eaen one of the six line loe-ere whichconstitute the three pairel is the saine in structure. The i arm l has`a projection il() which contante l with n cam 61 in which there ie :idepreision l 65. 66 is` a depending undertnrned lootl with a Contactlpoint Gi (see Fig. 8,) adapt ed to engage w ien the arm (3 rises in thede pression 135 with a Contact point 1li-l1 on the arm The :iiin 6" hai;a second contant point (31 adapted to 'ne held in oontuet with a.point', @'12 on the :mn G2. .The cani lll men- ,y tioned i5 one ot' dxzinns (Si. 74. .t-Ll, SP1, 1114 and 114. These. cante are. all fixed ona nhaft 1 12() driven le.' :i pnllei ,1.5511 which may lio connected lo':i pulley 140 to any source of i pon-er, The .4ax rame. ha# heen etated.are i divided into three. pairs ot' like coins, thatvis, the rainslAeind Tf'hare Similarly dispfmed depressione tlf and T3; the canv H1 andlil have, similar ilepreeaionf; and 15, hut .eet -at 12.0" from thelepreV` ione tlf and To; and the eains 1114 and 114 have ile,;.iii-;-t-:ionel 1113 and 115i het 1:20" from thiA depressions previl ouelymentioned. Il will tiros he. seen that upon the rotation of the ehnft1Q() the paire l ol come will aetuate the paire of line elo ers at;regular intervals. thus making .i poel sihility of connection of thenorth and sentii: linee sueceseively with each of the three. groups offour double switches. Agnin .re-- ferring to the connection of thelineelo;-;er.-:. it is to he borne in mind that the lower eon.- i tants 13"ad are rniinerted and the lower contacts t and $.12 are similarlyronneeted :is a pair and the. lower Conti-iets 102 and ll" :ire couple-li :i pair. The middle `vvitrh l (31 of the first line eimer i mni'iertedto the north line and the hiet middle eoniart 11 of the line eloeer 11i-i minnerted with the i south line 135. The ll`our intervening middleContacte` Tl, ft. 1). and lfl are eonnerled together as pairs, namely.`7. 8,1, and ',1. 101 .so that the north and south lin` l2 and ll arerapahle ol a potential series through the middle and loner ronniel ofthe line ttlnsive. ne hoh` heen i ited. are ronneeted as 1 follow/s2 t3"to line 11: T to line 15: R to the line 16:93:11 thi line 17: 1l)3 tothe line 1o; 113,' to the line lll. Thefse, upper fron@l tants throughthe pointe 153 and 1331, roten i -eloseix-f. The titiller 'mitin-ts l1"to 11K. in-

ring.r to Fig. il. may. therefore. introdueefv in the Circuit of thelines l2 and 1f', a Seletted g el'iaraoteristie iinpnhe either positivetrong. negative strong or positive weak or negal tive weak, according:is the selection has been made. hy the members; "31. :8 or

according to whieh was operated hy the key TU. The pairs. *i and J :ind10 and 11 are euceessii'ely operated in the order` o the `p.esentationof the ree/5seen Si and $17 i inlined by and 105 and 115 to theprojeetione 80 and il() and 101) and 110 by the rotation ot' the Shaft.120. The quality of impulse sent by the pairs H and S) and l() and 11 isdeterthe members 25,213,27 or '28 and 29, til), 3l or 32, according towhich has been operated through its mechanical connection 'to the key270. The switches 6, t5 and 10 alwaysl connect to line 1.2 and switchesT, 9 and 11 to line 13.

Referring now to Fig. i', which relates to the rereiiing end of thesystem, we have the north line 12 and the south line 13. In eerie@ iththese two lines are three relays iiizii are as follows: 150, 160, 170.'lfheno et, will consider respectively a strong relay` a weak relay anda polarized relay. 1.31 ie a switch arm operated by the relay 15H makingand breaking Contact` wit point-i 152. The arin 151 and the points 1.3:form the terminals of a circuit 153 in which is a battery 154 and amagnet 155. The magnet 155 has un armature 156 normally held away by aspring 157 and operating by suitable connection a punch 158. similarswitrh with rire-uit, battery, niagnet', armature? spring and punch areprovided for the weak relay 160 and the polarized relay ITU. Theseswitches, circuits, ete., are ninilar and are correspondingly numoeredl'roin 161 to 168 and 171 and 178 to i,ni'orni to the numbering of thoseparts delerilied in eonnertion with the strong relay 1.311. The weakrelay, however, has coniieeted to its armature 166 one end of a eireiiit1553 in whieh there is a battery 184 a iimgnet 1545 and a eontaet 182whieh is so dieposed as to he niet hy the armature 166 ol" the magnet of165 in the weak relay systein. The magnet. 185 operates an armature 1%held u hy a spring 18T operatively conneeted witli a pawl hook 188adapted to engage the ratthet wheel 1110 whieh turns a roll 1111provided at its periphery with pins 192. These pins are spared apart'anangle equal to the teeth of the rateliet 190 and, therefore, are adaptedto engage perforations successively formed in a tape Q00 as it is drawnpast the ends of the punches 158, 168 and 178. 201 is a die plate havingopenings Q02 m'ljacent to the ends of the pnnifhes 1.78. 168 and 178 sothat the punches may eut perforations in the aper Strip i211() as it`passes in front of the die plate 201.

Referring again to Fig. 1, it will he understood thnt the hars .230 to261, inchieive, :ire notrhed aerox-ding to a selective system so thateaeh ofthe operating ke'ys of ivliirh only one. 270. is shown. willselecta f'irtain f-oinhinaton of hars which it will deprees as it isitself depressed. This rontrnetion of slotted bars cooperating with a,sistem of keys to prodnee a /seleet ion is well ltnown and any one ofthe well known Systoms may he used. For instance, that system shown inLetters Patent No. 121,601 of Thomas A. Edison might be employed andreference is made to said patent 1n order to simplify the description ofmy present system. Inasmuch as I contemplate the employment of a trebleimpulse, my present system would employ the selection of three bars oneach depression of the key, as shown in the drawings, each bar having ahook, as shown in 2501, 2511, or 2521, engaging one of the fouroperating levers of the three groups. In addition to the bars 250 to 261there is another bar B (see Fig. 5) which has no notches cut in it forselection, but is operated by every key depressed, such as the key 270.0n the shaft 120 are two Cams, C and D, also a member E which is keyedto the shaft and has a recess E. A member F is mounted on the shaft insuch a way that it can be moved along the shaft within the limits of thespace between member E and member G. Member G has a pin G whose innerend projects into a groove' which runs around the shaft 120, thusallowing member G to revolve while the shaft 120 is stationary, and bymeans of pin G is kept from moving longitudinally on the shaft. The faceof G, next to F, has teeth, G and the face of member F, next to G, hasteeth, F, which will mesh with G. The teeth are formed like ratchetteeth, and the pair of members, F and G, constitute a clutch which isthrown into operation by amovement of member II in the direction of thearrow. Member F has a projection F of such length that it never leavesthe slot l in its longitudinal motion of the shaft. The pulley 130 ismounted on the member G and is driven constantly through the belt 140.When the key 270 is depressed throuvh the link I the bell crank J andlink K t e member Il is pushed in the direction of the arrow, closingthe clutch F lr and causing the shaft 120 to rotate with the pulley 130.lVhen the rotation begins the cam D causes the member L to press againstthe member Il in the same manner that the member K did. Just before thecompletion of rotation the cam (l, by means of the projection B', forcesB back to normal position, whether or not the linger is still on thekey. B must be restored to its former position before the completerevolution of 'the shaft, in order that Il may open the clutch as soonas roller L falls into' the recess on cam D. It will be seen that theshaft 120 will make one revolution for every depression of the key 270,and will stop always in the same position, namely, with roller L', inthe depression of cam D.

In the operation of my system, therefore, we will sup ose that a key,suchl as 270, is depressed y the o erator, selecting bars 250, 251, and253 an operating the switch arms 22, 27 and 32. We will suppose that therotation of the cams is at a phase such that the cams 104 and 114 havetheir notches 105 and 115 opposite the projections at the end of theupper members 103 and 113. This permits these members to rise and closesthe contacts on those members which correspond with the contacts 63 and631 as shown in Fig. 3, breaking the contacts which correspond to thosenumbered 61 and 62 in Fig. 3. With the parts thus set a current from theenerator will pass from the positive brus through the line 2, until itreaches the lower contact 321, passing through the member 32, up throughthe line 18, through the member 101, through the contacts above noted tothe member 101. Here it passes out through the series formed by thenormal contact of the lower member with a middle member of the lineclosers so that it connects with the north line 12 through 61, 61, 72,71, 81, 82, 92, 91. 1At the same time the contact 52 has been broughtagainst the contact 521. This closes the circuit from the negative brushof the generator, through the resistance 5 andthe Yline 4 conncctinthrough 52 and 521 with the line 19 whic goes to the upper member l1aand through the middle member 111 to the south line 13. There will be,therefore, sent to south line a weak current of negative phase. This, ofcourse, has been instan` taneous on account of the rotation of the camsand as soon as the Contact has been made and broken the second set ofcams 84 and 94 have become operative to work the line closers 8 and 9.The key is still depressed and the currents will pass as follows: fromthe positive brush of the generator, through the line 2 to the contact271, through the arm 27, and line 17, the line closer 9, through the arm91, across to the arm 101, through the arm 102 (which is now closed asthe cam depression has passed), through the contact 112, through themiddle arm 111 to the south line 13, but it is to be noted that thesouth line 13 is now connected to the positive brush of the generator.In the meantime the negative brush of the generator again through theresistance 5 is connected by the line 4 to the-contact 471 which isclosed on the arm 47 and .hence connects with the line 16 to the linecloser 8, the current passing through the member 81l through 81, to 71,72, 6", 61, and so to the north line 12. Thus the north line isconnected this time with the negative brush of `the generator. Thus thissecond impulse is sent to line as a weak negative current to the northline. As soon as the cams have removed the depression from the'secondgroup of line closers the third pair of cams 64, 74 have brought theirdepression oppo site the extensions on thelines 61, and 7, and a thirdpair of line closers is iinvoper-a tion. In this instance a currentpasses from the opposite or ositive brush of the generator through t eline 2, until it reaches the lower contact member 22 from which itpasses to the member 22 to the line 14, to the up -r member tl of theline closer 6, throng the middle member 61 to the north line. Front thenega-ive brush olI the gcnerator a connection is matie through the line3 to thc contact ll, tl'nough the member 42 to the line 15, ami so to'the upper member 7: of the line closer through the member 7 andsuccessively through the middle and lower members of the other lineclosers which arc now in contact, to wit: through 82, 92, 9*, 10', ltl`,1li, ll, and so to the south line 13 which is thus connected to thenegative brush direct and not. through resistance, 'l`hcre is,therefore, sent to north line a strong positive impulse. There have`therefore, been placctl on the north line in rapid succession a positiveweak impulse, a negative weak impulse. and a positive strong impulse.'l'hcse impulscs are' received at the opposite end of the line follows:

The first impulse. bcinpr weak. and positive, is capable only ot'actuatingr the weak relay it). This closes the switch 161, actuatcs themagnet 165. opt-railingy the perforab ing punch 168. "there is.therefore. punched in thc tape a single holc in the ccntcr of the tape.l'pon the rclaxation ol' the relay at the end of the impulse thek partsreturn, and the hook pavvl ISH which has been advanced by the magnetlfii at. the operation ot' thc armature ltti advances the ratchet whccll'JU and rolls the tape 200 on the roll lill. The pins 192 engage thepreviously punched holes centrally otthe tape to evenly move the tapepast'. the plate 201.

The scr-ond impulse, as has been explained, is a weak negative impulse.ThisI actuates the weak relay 160 as; before and the polar ized relay1T() broduccs n. similar actuation of the partsI as before, but inaddition causes the magnet 175 to work the armature lt'b' and move thepunch 178 so that two perforations are made in the tape, one ccntrallyas before represented by thc. weak impulse, and one at one side thereof,represented by the negative impulse.

The third impulse is positive and strong. Thus, it will be seen itisenabled not only to work a weakrelay 160 but a strong relay 150 and thusto actuate the magnets 165 and 155, thus producing in the tape a centralaperture corresponding to the weak relay and on one side of it anaperture corresponding to the strong relay. This aperture produced onthe punch of the strong relay is on the opposite side from that produced by the punch 178 ot the polarized relay. The tapeViIlLthereforc.hartl `l'ormcd in it a series of perfor-ations of fromonc to three holes abreast which in groups: of threc placedlongitudinally of the tape represent l a certain character. There areobviously sixty-four possible combinations in these groups and the tapemay. therefore, be passwd through a receiving machine adapted tointerpret in characters the character which was originally transmittedthrough the clmraeteristic impulse and received on the tape incharacteristic pertorations. An y type of receiving machine for theinterpre tation of the perforated tape may be em ployed.

My invention is, of course, capable of various operations,constructions, arrangements and wiring and all such modifications areclaimed as Within the limits of my invention if within the terms of thcclaims hereunto annexed.

what l, therefore, claim and desire to secure by Letters latcnt is:--

1. In a selective system a north andsouth line. a soun-e ol. electricalenergy for said lilies, a pair of lines connected to opposite terminalsof said source of energy, a third linel l'roin said source of energy, aresistance in said third liuc, a pair ot' oppositely connected lineclosers, a. group ot' switch pairs, said group having one contact of oneswitch olf each pair in circuit with one of said pair of lines and theother contacts of said switches alternately in circuit` with one eachol' said pair of lineI closers. and said group havingy one contact olone switch of each of the other pairs connected in twos alternately withone or the other of said pair of lines und said resistance line, and theother to said oppositely connected line closer, means tor actuating saidline closer and means for actuating:r the switch pairs in selection tosend to line successive plural characteristic impulses.

2. ln a .elective system a north and south line, a source of electricalenergy for said linee. a pair ol' lines` connected to oppositeterminalsI of said source of energy, a third line from said source ofenergy, a resistance in said third line. three pairs of oppositelyconnected line clcsers, three groups of switch pairs, each of saidgroups having one contact of one switch of each pair in circuit with oneof said pair of lines and the other contact ot' l-aid switchesalternately in circuit, with one or the other of said pairs ot' linecloscrs, and cach of said groups having one contact of one lswitch ofeach of the other pairs connected in tivos alternately with either oneor the other of .said pair of lines and said resistance line. and theother of said switches to said oppositely 00nnccted liuc closcrsalternately, means for successively actuating said line closets andmeans for actuating one switch pair of one or more groups incharacteristic selection to and to line successive plural characteristicimpulses.

- 3. ln a selective system a. north and south vteristic impulses.

line, a source of electrical energy for said lines, w pair of linesconnected to opposite terminals of said source of energy, a third linefrom said source of energy,` a resistance in said thii'd line, threepairs of oppositely connected line closers, three groups of switchpairs, means for successively actuating said line closers and means foractuating one switch pair ot' one or more groups in characteristicselection to send to line successive plural characteristic impulses.

4x ln a selective system, a line, a source of electrical energ aresistance, a plurality of oppositely connected line closers connectedin pairs, a plurality of groups of switches, means for actuating oneswitch of one or more groups to connect said source of energy eitherdirectly or through said resistance and means for successively actuatingsaid line closer-s if; pairs to send to line succes-` sive pluralcharacteristic impulses.

5. In a selective system, a line, a source of electrical energy for ia'lline,'a resistance, two conductors connecte( respectively to thepositive and negative terminals` of said source, a third conductorconnected to said resistance and to one of said terminals of saidsource, a plurality of switches having switdh elements connected to eachof said conductors and arranged in pairs and adapted as one or morepairs to he selec` tively closed hy a plurality' of keys, a plurality ofinterconnected line closers and connected in pairs to said pairs ofswitches, the extreme terminals ot said line elosers being connected tosaid line, and means for actuating said line closers in pairs in succes`sion.

6. In a selective system, aline, a source of electrical energy for saidline, a pair of lines connected to different terminals of said source ofenergy, a third line from said source of energy, a resistance in saidthird line, a plurality of oppositely connected pairs of line closers, aplurality ot groups of airs of switches, each of said groups having onecontact. of one switch of each pair in circuit with one of said pair oflines and the other contact of said switches in circuit with one of saidoppositely connected line closers, and each of said oups having onecontact of one switch o each of the other pairs connected with eitherone or the other of said pair of lines and said resistance line, and theother switch of each of the other pairs connectedwith the other' of saidoppositely connected line closers, means for successively actuating saidline closers and means for actuating one switch pair of one or moregroups in characteristic selection to send to line successive pluralcharac- 7. In a selective system, a line, a source of electrical energyfor said line, a resistance,

two conductors connected respectively to different terminals of saidsource, a third conductor connected to said resistance and to one ofsaid terminals of said source, a plurality of selectively operatedswitches connected in pairs to said conductors, a plurality of lineclosers connected in series with each other and with said line, saidline closets being connected in pairs to said pairs of switches.

8. In a selective system, a line, a source of electrical energy, aresistance, two conductors connected respectively to the two terminalsof said source, a third conductor connected through said resistance toone of said terminals, and a pluality ot switches arranged in pairsconnected alternatively in twos with said three conductors, a pluralityof line closers connected in pairs to said pairs of line switches, saidline closers being interconnected with each other and with said line,and means for closing said line closers successively in pairs.

9. In a selective system, a north and south line, a source of electricalenergy, two conductors connected to two terminals of said source, aresistance, a third conductor connected through said resistance to oneof said terminals of said source, a plurality of line closersdividedinto two groups, said groups being respectively connected to saidnorth line and said south line, a plurality of switch pairs arranged inthree groups, each group being connected to two of said line closers,means for selectively closing said switch pairs, and means forsuccessively actuating said line closers in pairs.

10. A selective system comprising a north line and a south line, meansfor producing electrical currents of different strength and polarity,means for systematically selecting said currents, and means forsuccessively sending to said north line and said south line a plurality.of said selected currents, said latter means including six linelclose-rs connected as two groups, said groups being connectedrespectively to said north' line and said south line.

11. A ,selective transmitting system comprising means for producingelectrical cur rents ofv different strength and polarity, a. pluralit'of switches arranged in pairs, means or connecting said switches tosaid means and for operating said switches to secure currents ofdifferent strength and polarity, a line, a plurality of line closetsconnected to said line and connected in pairs to said pairs of switches,and means for actuating said line closers successively in pairs.

1.2. A selective transmitting system comprisingy means for producingelectrical 'currents of dierent strength and polarity, twelve switchpairs aigranged in three groups and adapted to he selectively closedupon operation of the keys of the typewriter, six

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line closers, and connected in three groups to said three roups ofswitch pairs, a north line connected to three of said line closers, asouth line connected to the remaining three of said line closers, andmeans for successively actuating said line closers in pairs.

13. A selective transmitting system comprising means for producingelectrical currents of different strength and polarity, twelve switchpairs arranged in three groups and adapted to be selectively closed uponoperation of the keys of the typewriter, six line closers, and connectedin three groups to said three groups of switch airs, a north lineconnected to three of said ine closers, a south line connected to theremaining three of said line closers, and means for continuouslyactuating said line closers successively in pairs.

14. In a selective system, a source of electrical venergy for said line,a resistance, a plurality of line closers for sending to line multipleimpulses of either polarity, a shaft, a plurality of cams set atdifferent phases thereon to successively actuate `said closers, aplurality of groups of means for connecting said closers with saidsource of energy either direct or through said resistance, and operatingmeans for selecting two or more of said connecting means.

15. In a system, a line, a source of' electrical energy for said line, apair of lines connected to .different terminals of said source ofenergy, a third line connectedl to one terminal of said source ofenergy, a resistance in .said third line, three pairs of oppositelyconnected line closers, three groups of switch pairs, each of saidgroups having one contact of one switch of each pair in circuit with oneof said oppositely phased lines and the other contacts of said switchalternate] in circuit with one or the other of said pairsof line closersand each of said groups having one contact of one switch of each of theother pairs connected alternately with either one or the other of saidoppositely phased lines and said resistance line and the other of saidswitches t0 said oppositely connected line closers alternately, meansfor successively actuating said line closers and means for actuating'one switch air of one or more groups in characteristlc selection tosend to line successive plural characteristic impulses.

16. A transmitting system comprising means for producin currents ofdifferent polarity and strengt a north line and a south line, and, meansfor selectively sending impulses of different plarity alternately insuccession alongl said north line and said south line, said meanscomprising a, plurality of switches arranged in groups, a plurality ofgroups of line closers connected to said north line and said south line,and means for actuating the line closers connected to one of,said linesand the line closers connected to the other of said lines at differentinstants.

17. A transmitting system comprisin a line, means for producing currentsof difn ferent polarity and strength, three leads running from saidmeans, a pluralit of groups of switch pairs, the elements o the switchpairs of each group being connected alternately in twos to said threeleads, a plurality of sets of line closers connected to said line, theline closers of each set being connected in series with each other, saidsets or line closers being divided into groups connected respectively tosaid groups of switch pairs, and means for actuating said line closerssuccessively in roups.

In testinion whereo I ailix my signature in presence o two Witnesses.

ELMER A. BURLINGAME.

Witnesses:

WV. J. KIErnanonr, JOSEPH lV. Downs.

